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9a×3a×1a=2×2×2
27a^3=8
a^3=8/27
a=^3√8/27
a=2/3
p=9×2/3=6
l=3×2/3=2
t=1×2/3=2/3
jmlh panjang rusuk
=4(6+2+2/3)
=4(8+2/3)
=4(24/3+2/3)
=4(26/3)
=94/3